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I've seen it recomended to create floors using a slab assigned with a composition rather than separate solids, my question is how does that work when floor finishes are different, I found a posthttps://forum.bricsys.com/discussion/33169/bim-windows#latest that showed how the variuos composition ply's can be individually altered in shape, but in a building that has various floor finishes ie carpet 6mm, tile 10mm, stone in common hallways 20mm what is the best approach as they finish at the same top level so the screed has to vary in thickness. These areas are broken up by walls that would extended down to structural concrete but I doubt that the individual areas of a ply remaining could have a varying thickness, but then you have things like a kitchen/diner that is partially tiled or a matwel behind the front door. Logically that says that individual solids have to be used, I was just trying to figure out the best way of achieving that. Maybe a concrete slab with a composite on top of that for the different floor finishes (acoustic insulation, screed, tile, etc)